if `A+B =Pi/4` then prove that `tan A+tan B+tan A*tan B=1`

If A+B=90 then prove that sqrt((tan A tan B+tan A cot B)/(sin A sec B))=sec A

If A+B+C= pi/2 , prove that tan A tan B+tan B tan C+tan C tan A=1

If A + B + C = 180^(@) , then prove that tan A + tan B + tan C = tan A tan B tan C.

If A+B+C= pi , prove that tan A+tan B+tan C= tanA tan B tan C

If A+B+C=pi then prove that sum((tan A)/(tan B tan C))=sum tan A-2sum cot A

if a+b=90^(@) then prove that sqrt((tan A tan B+tan A cot B)/(sin A sec B))=sec A

If A+B+C=pi, prove that (tan A)/(tan B tan C)+(tan B)/(tan Atan C)+(tan C)/(tan A tan B)=tan A+tan B+tan C-2cot A-2cot B-2cot C

If A+B+C= pi prove that tan B tan C+tanc tan A+ tan A tan B =1 +sec A.secB sec C.

If A+B+C=pi , prove that : tan( A/2) tan (B/2) + tan (B/2 )tan (C/2)+ tan( C/2) tan (A/2) =1

(a) tan A+tan B+tan C=tan A tan B tan C